Points A, B, and form a triangle. Complete the statements to prove that the sum of the Interior angles of ABC nec in
Statement
Reason
Points A, B, and C form a triangle.
given
Let DE be a line passing through B and parallel to AC. definition of parallel lines
23 25 and 21 - 24
m21 = m 24 and 23 = m25
m24+ m2 2 + m 25 = 180°
angle addition and definition of a straight line
m21 + m2 2 + m23 = 180°
substitution
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Find the x coordinate of the point.

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.

What is the area of the shaded sector?